Explanation
Since P and V are not changing, so temperature remains same.
As degree of freedom is defined as the number of independent variables required to define body’s motion completely.
Here, f = 2 (1 translational + 1 rotational).
For a triatomic gas f 6 (3 translational + 3 rotational}
Mayer formula.
Argon is a monoatomic gas so it has only translational energy.
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